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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee67b748fa8f2a9e3ed785e0e1651c4a4ece1724ba2d8ba62e2c4442ad5a090' 
  AND token = 'FQwAET/j2rGXKNynPwriQNRS55sN5AgL3LLCxjHs+2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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