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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78a425f5ba9a6de156a68abad915a3e6d2efa0edaaff656a92c8b707f73b9bc1' 
  AND token = 'JOpWY9mTlBIIKGOHXtjOumGQKpwj52uIoayB96VzRxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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