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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7eb6b400bb767040ea372f7c71927dac55cba7a9d829734a1de89b595907f1' 
  AND token = 'bS4J60YX/gs2X2AXhHt7GBgTsa3USeeiVEUmGcJRi7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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