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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a10bdb9d93c07ef0f16ce96da8753ca9ac1eace0eda2f84270231eff640d35' 
  AND token = '5Q+7eJeJ+glub6qkh0QZURYgJm0oYv+wvDs8Ky+3L9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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