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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9246a852cb2beb68cd17e1a699e6d71743c55e72f6fbcd0e43c2b9177b9a43c' 
  AND token = '6pjaz0BIjhm91QBLyObN9xBh2UKRxQ5zyIrhy51cBEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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