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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9f0c1d427bdee46f61ba0debcf4b54c430d33ad0c9305acb91dd84898c5f5a' 
  AND token = 'B9Y1/WTQKmZBoEHLAUCac7TwQ6jGpq9/tJ+4rG4LtrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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