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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e57aa52f85b2cdb9041a44e615db2aa64421f5a2ceabb3a0b40e77ecaf5cf39' 
  AND token = 'tF2nJJLkKENZsOVzaBV2GRkgUkZGdKK8upQwM4OCOng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}