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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d6ead010d6c25cbd5389ed3c00455038328869128ace4274ca0bd7f4c2433f' 
  AND token = 'ZdjySmt3OLGcbNm5EefJCZsZi0KLR21g7d4MvlvLwBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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