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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba39d9f7b6f54de6a8254876cb0af787d4f808427811bd9771c69f709262b5cf' 
  AND token = 'tsL9C6JmIsb6fE2SoWKhZX8fpCYHNUgm15IYn5t2alg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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