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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df08625c32acbf002d593ebd8df5fc9744171b3c1067e8a5e7b21cf50e2bb047' 
  AND token = 'Br/y0CqI2iYeNf/MsZRir3DVTE+uW/4dGLjhxIo74sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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