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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f56a4ed1b6e9de02657c77239b39a85d30b8e0940b2b3200bda0c1979da59ac' 
  AND token = 'dB0m25EkvCrNIRXoRX5vSSrxfjXFaramkQB0PxZSl6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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