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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de0969a39245dc7b365fb7b8d65aeca3d4854cc461ca9e102971fddf39d2f1c' 
  AND token = '8Ye7+WftXBaWta7rV6K7q5GDqApqVu9boflpz/Ed8OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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