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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef1fdc4bf9347c532c1900c781528b973dfbc205ae957d76c27ee5de0c79b6f' 
  AND token = 'WNyuphadqrml0C8kBsw5et/ASFTgvpBqsrfnltaeCSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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