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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a153d29dbe94ac97becd256388e272b7145c34fef6a91e81e84e2e55e154711' 
  AND token = '/ZeRvF84bnwjoO2ZxCqsh9lU+N6SbL9bldPfH8AqcVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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