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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0f3345d2dd4a333f7115fb5c6b18197ad2d6db8d539b6fb3c75f4c64329137' 
  AND token = 'mp2CLfBcFg8SsMfxAI7ks9Xty2/b/9uH8hUz4tPyH7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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