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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97ddff5e91eb3c07d747de00341ddb6fc5a3820f4c30582e3a2bd4de4aae664' 
  AND token = 'wi9AKYzrdXKYpAWjBlOeszP62Jdxw79E1S9Gh9vPzMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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