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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca1bdb56573d054c7efc510e28e05055a18f8163e30a4a94217773ecc6febd4' 
  AND token = 'HzyQADjZwa5M0k0axwHRwZLef3gMJ3r9AmYmc7ab478=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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