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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c069f56c9fd449da7990fd511cde8c1f5f7057a51dc91af543ca37aeeabdd5' 
  AND token = 'kiSnq+wLZWv0lF36Ned2hQZbWIoKHGd8hJ8oxgTcBc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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