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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ad7323e38d41697c60d4b70b211f9f868124f71833487ba59bf6b08a96e7ea' 
  AND token = '9jMd3TPziewN2sqXGv8U0bt83iV24V5K2feo6/dkq6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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