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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c348f553aaba6b66d7d1b18050f249b4fc9250f34c480850ab550ccfec3e26' 
  AND token = 'bb2EZImYC0w5prZJxWDa2os3ERBIJI9Uehst0FygnuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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