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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0347895c0f34fa5233deac8ae97c8236578edd17eceee7c44bba3a4d687cd518' 
  AND token = 'DSbJBpY0031rRNgYQN7ZrsC0X8qAodsXYXRzlfid4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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