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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2d43e39890d93e9644ed492f9406cfe330fb79dcb8a030f2264ffc3c53f11a' 
  AND token = 'f6II13Flg7kHMLkT5mSQj0Hm1XMx0kl08cCWBmZk65Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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