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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5cbbca6a271819d9ea8a7185d383f065fc0986ed7fa6b244b952f7dee9789b' 
  AND token = 'p6ngjbd7aF2D2TZt1xcFkI8rsa+aOeqj9WjaQvaEWWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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