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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7c3405a93776b43667882f52326db8bd4bc33c3b01c7e756729aaecc41a402' 
  AND token = 'vthSKn3YaNlYpH6QqS+Ur2oEslT9jhg+FKFtotQGjqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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