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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae95e5265d6a90e4d14a9bf47570275ece8c68bf1dfc8a68c658a83236b15c7' 
  AND token = 'X2c1+JTqGA4t+vTfksWu2WYt7pXSO7IV3nkVJPxPjbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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