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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd867cc24706160aa80c2688f44171d067d82c809a4a3ecc73e6ee99202c6fcd7' 
  AND token = 'P/jfu25oKyiiKwMmS+lvGBKr7S2CzT7wY/tRDPjMzRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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