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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1814e9b79522822e82839fc8fc4b5e5686bbdeac8b9b65dbea2cb266b450f801' 
  AND token = 'smJrcExwwSVr/qX2CM4ftddiviube9PJrNzzGq9npYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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