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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17db19e8e569c789aba319d634705051f46ad9d2833c65aba96db1f2e413d660' 
  AND token = 'CE8kk+6Lhuzyg/x94GJQQxrWg1S1Z+zu1QFTeYYGHlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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