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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2622fe73177334f9606f8912d42c29703eca5c01d598c57808989d94742c615b' 
  AND token = 'cXh0Cx11JWGLl8vA5tGJZ1Mh6JcBxUOx9QH55XNRrxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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