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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9f3bb1496c2eb0798dc9004ac022b620fa840779519259873c69002a378b7b' 
  AND token = 'TOabg5e3/+EQLkTky7dIqLmRa8Z0gruV8JRK1UoPYl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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