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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7516e1bc4dad28be086e99569b487f3ac0deabf8ef263108e38738d3c9c4d5ac' 
  AND token = 'KDp58s30y1uaXO1R7KjwSoQrJOlKCqd2yctw4jJfz8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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