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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42929fdfd44afdfb6efb16a17b0e58929654cb820e7ffc10e522aa92ddac5cb9' 
  AND token = 'EZiOlCfze/prEzgGVVahi3bnaLyUuK1NWnPep7NxvP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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