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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce0b9c831181e77fdd60f0ee7dfd00f4c71a657b1cee75c632e8ad70c6460c9' 
  AND token = '+q+fikCAFLFn5dmP64bfyA4SsTEJh52EdaCSU1nFRR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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