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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789aa1e383898c49fb94105ed9e9d75cae7c1835dd502f97746c41e4bd8f54c1' 
  AND token = '9MfhJ0Lw3Z8xlf/iEfKvH63Jg5dOTOl9oirr/14lRRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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