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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36744bc34d430a91aeff756c01b5270b3836601306a40a812a083eb74157506c' 
  AND token = 'iqE9BKz0lKPa60WhiMeDTPZ0FPozUbWOr119mDKQ/vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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