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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e254e7d0d19115529e2ddf747a0a13ad7a65c22fabed5443cbebaf6be8c003d4' 
  AND token = '0jrLUbrgmEsIspTCNd5bZCz9j7dARsuln6vbLUeMM1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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