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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8698a5761790bc61a16535ad08565f9e74afb4b91b2c577e3953d933d094e1bf' 
  AND token = '3Adyie1X3M3+/LkICXEx4krj3llJs+vsH7/QJLtE/2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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