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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086a02799ed705f9918ca110118eafb54cc389f5fb6ae1562e69b1b53455b233' 
  AND token = 'SMkhECR9qF4T0ck5Pz6XuDSGfnaSqpBQR/u5iwOlGek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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