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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1606359ad069ca303d0b9ce3c4b13a89b8789b56ae07d293e2cb738d73a818a7' 
  AND token = 'lYtOO8xnNZuxC9L53Z+geNQ+2+goza5OW3Rry9OTWBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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