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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdc972437b9c21f793b64c26369890e6c43e7893d9974e5d0256352e0b1f8c1' 
  AND token = 'woAwAn/kcjqIoaZKgx8HIl3QYRyICBpINP7RWcsCojQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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