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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3a7310c6b5d45304f6d2806bc5b6582828ba34a1e56c61b423cc727258c7eb' 
  AND token = 'NwLw0DxSfaf/rqC/59Hm3ch31L9Z13Qw0e1fonTK3fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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