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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662745661efb318ba5b44dee9b42504cbb13be4898b139558d55e6123e360f63' 
  AND token = 'INqU7wFhYjm/+1DPu22V3ttBbA4HlmFgRuXpT00/g1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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