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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8044fbac996bab5f11b7a19ea9099547aa6a51c9e810fc5e56f360f7b6ee5a3' 
  AND token = 'YW44GwwBPCV8K8l7sA5eSwfCTOUtXGELGkvAYD0/jQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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