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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb285401f8e3b2bc4f2ce74a73034504b12c68faf18cd390026839ef9cdb0fa' 
  AND token = '/pZ1tiVvcfcOg3hLrq1rXUxdZsPx1hcHEbxVpmML3JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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