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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cb28a77a335a7b1ed7977f1a59ac27024e26ca7636ad42742776f3733862dd' 
  AND token = 'ySe3Ft3hNb5ysFpMHNM861FpJghioi5YkIkLCqEYexI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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