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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9b3bf83724273cf2e7db9f992ad7e36faf0f77449a80b2c150b2ef2e67fbac' 
  AND token = 'nKv5VHunfEpYag9yD69Z/Q0+vdafiJEIYT1jA3OZ4/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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