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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723ea784578cc5c58cd9e9372abeabc319c74a5c4eb33b80050afe6dc1254be5' 
  AND token = 'lDaCqjEJEtgfm/hl3Z+M/1n133y6O2a1XG9ypUsaclk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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