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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a17ca6a6e10febc3a98dd348d0595467febcc817151a6692b0cecd3c8aa574' 
  AND token = '0V/UgwI5aKpHO04Bd0xfQgpDvmRbpY6GdbINeO4QJ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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