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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e7810e40ae7d74fe1c28fe2ae3a3f19202341d86c801aba313a5442249a152' 
  AND token = 'xWO5P51caKxeL2lkq3mIC5nmpmxE7UtKt/O7wuvRysA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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