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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef5b09b2bb590a2e03348bafed4f9c8f305595dd71958b689583d7f6a695dc7' 
  AND token = 'S6GYaGG6qjzZIMPm66EN86gvgPtDWhCF2pHT64es0pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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