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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c972dfed10453e64a9bb82a4208d1719dac7881c1c214d59ce156f2f9b59d193' 
  AND token = 'uW8ryfV4H9ZazUZ2tRaJrfygm58RzuukMs15WE6rpDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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