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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32750f554c2c47d868f5ff10e12bbf5003fa6090b6f2724851427ca0de5575e' 
  AND token = 'GUfW1kBSGZf9TjvEgaa1kKMZHkovIsHne0JQYBssawM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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