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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bebc4e4dc3d40e36d5d704c05008f134a8c240b138e1878e4e708775aded6f' 
  AND token = 'FSD1AY7EnUJfkeS5CneehNlG+REwZrgSzpZnWL/x9N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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