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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7f8b8b5ff95502e4db13e83165421a496ac04b659b30f96fede96532c1585f' 
  AND token = 'yge8xMlms+JHzcS18w9YsidQY2OYMUJkIGd6FfZO8y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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