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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf83f70f3d9de6ffd34846ea8f9a097e72e4bf0e41eadc6c4bc95e7e1b95f21d' 
  AND token = 'FYt2OhqcoLJbwCJNB+qUXvw1GLJMwo53ko2kotJX6pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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