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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ca6c01973e69855dcf1511f25dc3371953af27861e254ac78dcfea1435b00d' 
  AND token = 'ARCRheYdF66a/06AYjGZg9lPvdqih3LSTX8oXwqcV8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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