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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4aa260273135d7fbafe91b9bc1d7207caaf26f01c3a7ea00eaa1b6cb70bf077' 
  AND token = '/EVfcMchxkXoJZBX5SG0FvSVK78fveEmM/6XTr9jaTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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