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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2293d56d5f16df834526b2a599a421a9a88aab8895216f7495ee27b1fb545be' 
  AND token = 'M9tzUBucb52/84byNC5zFn8cz6R7Twx0yT7E4YgHi3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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