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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fc75b476f63fe38e643d569e09490546e0eb979ad1b40217b6013e754e4ee4' 
  AND token = 'kvjtvNr1pbUW6bi5ykVUNTurcF0OZAzD1l/4kA5J/yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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