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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0e3031a75423e1eb177eae6aa6ba3388862992633779ea05123b1fb7246ade' 
  AND token = 'GakoB7eAYlZN3cw0H+L9bPjr2xrCGjobvNZrBIRqIA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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